Insecticide



Patented Feb. 3, 1942 INSECTICIDE Andrew F. Freeman, Bogaiusa, La...assignor to Henry A. Wallace, as Secretary oi Agriculture the UnitedStates of America, and to his successors in oillce No Drawing.Application July 2, 1940, Serial No. 343,560

(Granted under the act of March 3, 1883, as amended April 30, 1928; 3700. G. 757) 1 Claim.

- This application is made under the act of March 3, 1883, as amended bythe act of April 30, 1928, and the invention herein described, itpatented, may be manufactured and used by or for the Government forgovernmental purposes without the payment to me of any royalty thereon.

This invention relates to improvements in materials for destroying orchecking the growth or multiplication of living organisms. whether plantor animal, which are economically injurious to man.

An object of the invention is to provide a material suitable for use asan insecticide.

176 C., is insoluble in water and ether, and soluble in acetone and inalcohol. The compound may be reduced to an impalpable powder by grindingand applied to vegetation either dry as a dusty or wet as a spray. Thecompound being somewhat soluble in refined mineral oils may be appliedas a component of an oil emulsion spray.

The value of Lb-diphenyl semicarbazide as an insecticide is shown by thefollowing tests:

1. when tested by the apple-plug technique of Siegler (Jour. Ec. Ent.,27, 1140; 1934) 1,4- diphenyl semicarbazide gave 65.1 percent fruit freeof worms.

' 2. when 6th instar southern armyworms were led dusted collard leaveshaving a deposit of 1,4- diphenyl semicarbazide, or 170 micrograms persquare centimeter, the mortality was 83 percent in 48' hours.

3. At a concentration oi. 170 micrograms per square centimeter1,4-diphenyl semicarbazide killed percent of 5th instar southern beetwebworm ied dusted squash leaves.

Having thus described my invention, what I claim for Letters Patent is:

An insecticide containing "its essential active ingredient 1,4-diphenylsemicarbaside.

ANDREW I". FREEMAN.

